Here's a startling revelation for you...
Every piece of commercial or military surplus ammunition you have ever bought, ranging from lowly .22 RF to 9mm to .30-06 or others, has been loaded VOLUMETRICALLY.
They don't weight the powder charges. A given weight of a powder will occupy a given volume. Once you know those parameters, you can turn out some incredibly accurate ammo without ever having to touch a powder scale.
I've been loading volumetrically for over 2 decades, both handgun and rifle. I check every 5th to 10th round, and also inspect powder levels visually.
The only time I have ever had a problem is when I got lax in my loading procedures and double charged a .45 ACP case. That certainly wasn't the fault of the equipment, though.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.